The Circulatory System

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The Circulatory System
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Transportation system by which oxygen and
nutrients reach the body's cells, and waste
materials are carried away.
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Also carries substances called hormones, which
control body processes, and antibodies to fight
invading germs.
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www.biosbcc.net/doohan/ sample/htm/heart.htm
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Parts of the Circulatory System

• Divided into three major parts
• The Heart
• The Blood
• The Blood Vessels

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The heart, the lungs, and the blood vessels work
together to form the circle part of the
circulatory system.
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Circulation

• Two parts
• Heart acts as double pump
• Blood from the right side pump is dark red and
  low in oxygen (oxygen-poor)

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Circulation

• Travels through pulmonary arteries to lungs where
  it gets fresh oxygen and becomes bright red
• Blood from lungs through pulmonary veins back to
  the heart's left side pump
• Pumped out into the body

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http//users.tpg.com.au/users/amcgann/body/circula
tory.html
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3 Kinds of Circulation

• Pulmonary circulation
• Coronary circulation
• Systemic circulation

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Pulmonary Circulation

• Movement of blood from the heart, to the lungs,
  and back to the heart again

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sln.fi.edu/biosci/systems/ pulmonary.html
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Coronary Circulation

• Movement of blood through the tissues of the
  heart

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http//sln.fi.edu/biosci2/systems/
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Systemic Circulation

• Supplies nourishment to all of the tissue located
  throughout the body , except for the heart and
  lungs

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http//sln.fi.edu/biosci/systems/systemic.html
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Blood Vessels

• Hollow tubes that circulate your blood

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Three Kinds of Blood Vessels

• Arteries
• Veins
• Capillaries

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Arteries

• Carry blood AWAY from the heart
• Heart pumps blood
• Main artery called the aorta
• Aorta divides and branches
• Many smaller arteries
• Each region of your body has system of arteries
  supplying it with fresh, oxygen-rich blood.

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Arteries

• Tough on the outside
• Smooth on the inside
• Muscular wall helps the heart pump blood

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Have strong, muscular walls The inner layer is
very smooth so that the blood can flow easily
http//hes.ucf.k12.pa.us/gclaypo/circdia.html
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http//sln.fi.edu/biosci/systems/circulation.html
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Capillaries

• Very thin
• Only one cell thick
• Connect arteries veins

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Capillaries

• Food and oxygen released to the body cells
• Carbon dioxide and other waste products returned
  to the bloodstream

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http//sln.fi.edu/biosci/systems/circulation.html
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w3.uokhsc.edu
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Valves are located inside the veins. The valves
only allow blood to move in one direction.
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http//users.tpg.com.au/users/amcgann/body/circula
tory.html
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Veins

• Carry blood to the heart
• Receive blood from the capillaries
• Transport waste-rich/ oxygen-poor blood back to
  the lungs and heart
• Valves are located inside the veins
• Allow blood to move in one direction

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http//sln.fi.edu/biosci/systems/circulation.html
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The Heart

• Size of your fist
• Thick muscular walls
• Divided into two pumps
• Each pump has two chambers
• Upper chamber - atrium receives blood coming in
  from the veins
• Lower chamber - ventricle squeezes blood out into
  the arteries

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http//hes.ucf.k12.pa.us/gclaypo/circdia.html
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Close up of heart valveHeart sounds are made by
the valvesas they open and close
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Blood

• Pumped by your heart.
• Travels through thousands of miles of blood
  vessels
• Carries nutrients, water, oxygen and waste
  products to and from your body cells.
• Made up of liquids, solids and small amounts of
  oxygen and carbon dioxide.

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Blood

• Red blood cells carry oxygen from the lungs to
  all the cells of the body.
• Takes carbon dioxide and transports it back to
  the lungs
• About 5,000,000 Red Blood Cells in ONE drop of
  blood.

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http//hes.ucf.k12.pa.us/gclaypo/circdia.html
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Blood

• White blood cells protect the body from germs
• Attack and destroy germs when they enter the body

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scienceu.fsu.edu
www.merck.com/pubs/mmanual_home/ illus/167i2.htm
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Blood

• Platelets are blood cells that help stop bleeding
  

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user.gru.net/clawrence/ vccl/chpt7/plate.htm
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Blood

• Plasma is the liquid part of the blood
• About half of your blood is made of plasma
• The plasma carries the blood cells throughout the
  body
• Plasma is made in the liver.

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http//hes.ucf.k12.pa.us/gclaypo/circdia.html